Greasemonkey/ Tampermonkey @match for a page with parameters

I'm working on a script that must be executed in a certain page, depending on the parameters it has. The URL is like this:

http://example.com/page.php?key1=value1&key2=value2&...

And I need to match it when page.php has the key1=value1 among its parameters.

Now I'm using

@match http://example.com/page.php?key1=value1&*

But it doesn't match if page.php has no other parameters. It also won't match if key1 is not the first parameter either.

Is there any way to match a page according to a parameter?