TL;DR there isn't a direct equivalent and scanning the entire key space is always slow(er) - you should avoid it unless your intent is getting most/all of the keys anyway.
There are two Redis commands that allow you to scan the keyspace - one is called SCAN and the other one should not be mentioned nor used for anything but development. Unlike what you're after, however, these commands:
1. Do not work on ranges of keys, but rather on glob-like patterns
2. Do not return the associated value, you have to specifically read it
Generally speaking, you should refrain from practicing such read patterns unless you mean it - in most cases, you want the responses fast and cheap, so a full scan is almost always not the right way,