Redirect to a different page

How to redirect users from one page to another

[kektex]

Hello,
I am getting a lot of visitors from google image search to a file that is no longer on my site.
The file was the old index.php accessed like this:

www.example.com/index.php?action=browse

I made a site redesign and removed the old script that used that URL so now all the people that come in via Google Image search for that file just get my new index.php on the frame below the google console.

I want to redirect all users looking for
index.php?action=browse to
error404.html
without affecting the regular index.php

My .htaccess skills are non-existent so I`m coming to you guys for help!
Thanks!