apache rewriterule htaccess security

If I configure an .htaccess like this :

RewriteEngine On
RewriteRule ^([^/]*)$ /view.php?key=$1 [L]

Which transforms

original URL   http://ift.tt/1yeGsc6
rewritten URL  http://www.test.com/123

Is there any mean for an attacker to find the real php file (here view.php) and directly access to it (in URL bar)? Cconsidering URL-bruteforce is not an option, nor .htaccess reading.

Thanks for your advices.