Do you mean Rapid Shot? If so, no.
Launching an Eldritch Blast does not use an attack action. It uses the "activate a spell-like ability" action, which is a standard action.
Using Rapid Shot requires a character to be making the Full Attack action, which can only be done when making ordinary attacks. Eldritch Blast cannot be used as part of a full attack, and therefore Rapid Shot cannot be used with it.
To use Eldritch Blast against multiple targets in a single round, a character needs to take either the Eldritch Chain, Eldritch Cone or Eldritch Doom invocations, or the Quicken Spell-Like Ability feat, for which a warlock becomes eligible around 10th level.