How to redirect all traffic to https except subdomains

I have recently redirect all traffic to https but I want to keep my subdomains on http only. Please help me to sort out this.

this is my rewriterules

Options +FollowSymlinks
RewriteEngine On
RewriteBase /
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [R=301,L]

this is my virtual host code

<VirtualHost *:80>
ServerAdmin  test@example.com
ServerName   staging.example.com
ServerAlias  staging.example.com
SetEnv       ENVIRONMENT staging
DocumentRoot /var/www/staging/
ErrorLog     /var/log/apache2/example_staging_error.log
CustomLog    /var/log/apache2/example_staging_access.log combined

<Directory /var/www/staging>
AllowOverride All
Include /etc/apache2/sites-available/example_dir_rules.conf
</Directory>


</VirtualHost>

<VirtualHost *:80>
ServerAdmin  test@example.com
ServerName   example.com
ServerAlias  example.com
SetEnv       ENVIRONMENT production
DocumentRoot /var/www/production/
ErrorLog     /var/log/apache2/example_production_error.log
CustomLog    /var/log/apache2/example_production_access.log combined

<Directory /var/www/production>
Include /etc/apache2/sites-available/example_dir_rules.conf
</Directory>



</VirtualHost>
LoadModule ssl_module /usr/lib/apache2/modules/mod_ssl.so
#Listen 443
<VirtualHost *:443>
SSLEngine on

SSLHonorCipherOrder On

-------------ssl code----------

ServerName example.com

-------------ssl code----------

ServerAdmin  test@example.com
ServerName   example.com
ServerAlias  example.com
SetEnv       ENVIRONMENT production
DocumentRoot /var/www/production/
ErrorLog     /var/log/apache2/example_ssl_error.log
CustomLog    /var/log/apache2/example_ssl_access.log combined


<Directory /var/www/production>
Include /etc/apache2/sites-available/example_dir_rules.conf
</Directory>


</VirtualHost>

Please help me to sort out this. Thanks in advance.