SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '219619ab71b877a64e778ec64b3fe5823ce23d3b5afa48340bbc45235542b5dd' 
  AND token = 'Y14vZB9XxMGUYemwk8/Mip73GslzsmVM/rIEa4E8pqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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