SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85aa2d8c0f102b587896f3a535a461e173f4053534a3191f717d4bdee81182a6' 
  AND token = 'YClnOCKcSIU4X9J3hgWYAXTidnl4PGQe+iKuB8X8fPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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