Both those phrases could be used to ask whether they have entered the apartment very recently. There is no grammatical way of specifying exactly how recently you are talking about, and the two questions in your example both mean "very recently". In English a common response to such a question would be
No, I have been here about half an hour.
Well, I have been here about 10 minutes.
Yes, I just got home a moment ago.
The person you are talking to may be unsure if ten minutes qualifies as "just entered". This illustrates that "just entered" in your question could be interpreted to mean anywhere from a moment ago to perhaps as much as half an hour.
English speakers will therefore often over-emphasise the shortness of the time in this case, saying something like:
Have you just entered the apartment, right now, just a moment ago?
"right now" and "a moment ago" should not really be necessary but they show the listener that the asker means "within seconds".
If you want to be more specific than that, you will have to state how long as a unit of time.