SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346052cebf47f0cad994dd1c2b629b9b1b9c7f9eef97d7db62678703f6da7358' 
  AND token = 'xOI0wyohEIsZqRzn7xBa0ZRKGqv2F7mitYWzFg4Ta3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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