https://www.humblebundle.com/store/f1-2015/
And I got this message with my key.
"The redemption deadline is April 7th, 2018 at 10:00 AM Pacific. You have 15 days left!
Immediately after 10AM Pacific on April 7th, the Steam key will magically vanish as if it were just a figment of your imagination, leaving this cryptic message behind in its wake."