The Kospet Prime has an IPS screen not Amoled. Always on screen mode is for Amoled because of the lower power draw and low risk of burn-in.
I know that some may say that you can use various options to make your screen stay on but it will
a) chew up your battery life.
b) reduce the life of the screen
c) you can very easily find elements of a watch face will become semi permanent on the screen - burnt into the screen.
So short answer is no.
Long answer is as above…
Zeblaze has released a watch with always on screen and it is not amoled.
I believe that there will be problems with that model in the long term.