SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bed324d9a87cbbc52d73771aaa50a6c7c9744f8f4c7c270d0f72efc7a6096493' 
  AND token = 'ajZMDhvK81bmgdRFsPUg81OQeLPhvlGW1i6Z8Y842HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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