SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '585f03b5d19a1cb2925a501b88022a3d47886301003da72080bc964f7eda7e61' 
  AND token = 'g3syRHISPGUMgDa4Mt+/RkVzjsQvxxkitbaYvucFpR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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