SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29b7e1a9e512f71cabfa52c4d681a8e58d8878bc220430568576921de5991b9e' 
  AND token = 'bgMgeUJWJojuOhyzoCCIYPrfQ6qt3pAjXaX4O0GEZDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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