SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0877595cc1374ba7862a320166ef92034f868aa85198766fa5adbc8d5dd23c3f' 
  AND token = 'uURV1wfLjPxyf4IzXpoHUhWTivwHh1YiUjCGfEc3zhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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