SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa1b4b1f54c594c515bc6d5508638a281715a9f222dcf334473a829c3e0f363a' 
  AND token = 'nJH/AMWZUvLLvO7h23zsFp3eAtzn3y76aQPH8hiHTqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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