The ornamental design for a snacktray, as shown and described.
FIG. 1 is a top perspective view of the snack tray;
FIG. 2 is a left side view in elevation of the snack tray;
FIG. 3 is a right side view in elevation of the snack tray;
FIG. 4 is a front view in elevation of the snack tray;
FIG. 5 is a back view in elevation of the snack tray; and,
FIG. 6 is a top view of the snack tray.
The bottom of the snack tray is not claimed herein as it is devoid of surface ornamentation. The broken lines showing a cap is for the purpose of illustrating portions of the article and forms no part of the claimed design.