SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1140ce8f29d4a7651ccb850b04e7d06cb8649cd36f8224aafedbf965376118f8' 
  AND token = 'YPxA4k5/PgodjixpJEhxQABzHLNuNSY52wwSEhfTFgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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