Kairats away record in Europe is very weak:
Olimpija - Kairat 1-1
Kups - Kairat 2-0
Even if you see that they played a draw against Ljubljana, it should be known that Olimpija were very dysfunctional, they even sacked their coach because they have underperformed, so I do not see it as a "won point". Truth to be told, teams from Kazakhstan are notorious weak away teams.
They have won their matches at home though, and this is significant for Kazak teams. But they even get beat by Finnish teams away.
Slovan should be way too good of a home team to not win this, especially because it is a must win situation. The experience is on their side, and they have also proven to be strong here, even if it was against Zrinjski (4-0), they have also beaten Podbrezova (4-1) in the domestic league at home. They lost in Kazakhstan on a later penalty, and one goal is not difficult to catch up to.
Conclusion: Kairat have done amazing, already secured a big mission for Kazakh football. I expect their journey to end here as Slovan will take care of business at home. Kairat have a lot to learn when playing away from home. I take Slovan with Asian handicap of -1. Crazy price if you ask me