SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9531abc9c71892efde797ec1402a2c7d7fa98b9346b52aa5b79f2bf366e23a05' 
  AND token = 'kr7/xK20/c7geR6QkJ679OuCq0CuVI1Kj8BJvjKSGGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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