The ornamental design for an expandablekeyholder, as shown and described.
FIG. 1 is a perspective view of an expandable key holder, showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a left side view thereof; and,
FIG. 8 is a top view with sides adjusted closer.
The broken line showing of elements in FIGS. 1-8 is included for the purpose of illustrating environmental matter and forms no part of the claimed design.