SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a99dd081b50388800f81f5a48b7f218f119518337f43b10a3ed54adb28928439' 
  AND token = 'bxB0CZjzyv72PicPjMJ9fL3GgVu45WRRVYsxsigQJpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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