SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba2f0c7f7b4d500946c05640b73a1f1e27446c363d6ffb4fbe7e3f2e98e66410' 
  AND token = 'lZM4V6AUe3oqZ9csgGRXS4vWwU/TZBR5eI/94fShK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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