SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebdc8cd088cf13bc5a831dffc77b011fa5677da934103c252295a985210f4e6f' 
  AND token = 'YyVrqC9Zv+OOd444tvmc00WToWF9fMmRzjwg+hnADI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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