Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '387fbae41bfc53ba6ba81818b814a26f5ce8d1957a4b67c4e771ec6d9b110698' 
  AND token = '4UCL/PqvKXBSneSW2Vf6dck3PPdNBrrgsDdAJEmdzQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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