SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '907d5641df030c1f3a6400ed17b2089b1cb7d9cf0ba8dd9144f1eefc0d948a8b' 
  AND token = 'xzuH++hY5y/GvpIUcBqJeE43nyOJ9KX3uL3NVXKf5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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