Get content from backend on specific api key condition

Hi all, i m new with fastly. 

I'm trying to setup a condition: 

For a list of api key and endpoint i'd like to get response directly from backend. I need to not get content cached. 

For example: 

/nocached/content/?key=abcde3456 

if key = abcde3456 i want to get fresh content (not cached one)

I m using jinja template and yml configurations file.

How can i achive this result?

Thanks