SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e811bafe689ac3091f30dda0a5d7b16d663df3ad6f7288eeb9d52f17ee77662' 
  AND token = 'JtF5U5dqF6KqUhK4yHL8mdcTUYLY42BwujF9jvuAxH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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