Premiere Pro: Curves for adjusting video effects and its keyframes?
You can toggle the display of the keyframe timeline by clicking the little arrowhead to the left of each individual effect in the Effect Controls panel. If you can't see the panel, you can open it from the Window menu. If you don't see any effects in that panel, make sure to select the correct clip from your current timeline. 

Here's your image with the arrowhead encircled in red (in the top left): 



For more information on setting smooth transitions using keyframes, check out my answer here.