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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef2463efbd3f99013acb05b550b7a373ffa24ff8f7676fdba5f7267da1be65b' 
  AND token = '7xyICtFlW5YMwRoFoHGs3eIC4xPxO5Flsjd3XgFQjSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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