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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c2b5f93add1a41716dc8ac6b85d083b2150b18ad63f80b19062c4333af9202' 
  AND token = 'cvahAMU5ux8pZs8m2+hvDrke7DuFsrrhRLQsOQDwF+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}