Secure Download Links with Tokens, etc

I have a site that allows people to download files. I'm also using a php framework called SLIM. Currently, we protect our files with a setup: [login to view URL]<?$filetype?>/?id=<?$fileid?> This is good, but I want tokens on the link and the actual download file. I'd like to take the file security a step further. I would like something like this: http://domain.com/download/122039/RFloRzkzYjBxeUpmSXhmczJndVZvVXViV3d2bjExMUcwRmdhQzltaU1USXlNRE01T2pFM01pNDJPQzR4TkRFdU1qQTRPakUwT1RVME9UWXdNREE2Wkc5M2JteHZZV1JmY0dGblpRPT0=# When the file is in the download manager, it looks like this: [login to view URL]