How do I email my co-authors asking them to review a manuscript very quickly?
It's much more important to send something right away, so that they have as much time as possible to look at it, rather than wasting precious hours finding just the right words.

State clearly and concisely what you are asking them to do, and when you need it done by

Explain briefly the reason for the short deadline

Apologize for the rush and acknowledge that they may be unable to do it in time

Have a backup plan in case they cannot meet the deadline.   You can always ask the journal for another extension.  Given the amount of effort they have already put into reviewing your paper, and the promise they evidently see in it, they have an incentive to work with you.  The worst case is they say no, in which case you may need to withdraw your paper and submit to another venue later.  That is annoying but not the end of the world.