SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05b0c651736c0770c58f333da1a252549204788a134d1f52a26e2fe58cce99fa' 
  AND token = 'OBydoV+wdO/gG/DQfz6GtqhRQ1E2mXEPaT7kl/27rwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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