A quick starter question about the module

Apologies if this is a rather basic question but I thought I might just ask it up front of spending time experimenting.

I am looking for something a little more flexible the the Shield module and I wondered if this module might be a candidate.

What I want to be able to achieve is the blocking of Drupal pages at all UNLESS there is something like ?accesstoken=ea5h6xze_etc stuffed on the end of requested URL and that accesstoken value is recognised.

Simple as that - a recognised token and BAM, we're in or 403 if not.

Am I in the right place?

Can anyone help here?

Thanks all!