SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14309d41fdca0e604e2aecebe826276ff151fa22f793ae682c200fdd5f8a385a' 
  AND token = 'xCBDLRzOe7P/bSZEPlBgJ4yRV3PdjNGhjqKkF5uxwK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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