SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b08f945455009fbba7ff0f0c3c4084282412449d425131ea0869f0bcf262bb' 
  AND token = 'LdAHT/RfmDOxBxEwzrPo+QI0GD6OYHDupUvLhUMOdSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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