SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c95f26024d19dd65c96fd484ed84e5a9d90913ba79701292a0e073c3f84107' 
  AND token = 'aV5Ww38KB5jPhyC/gwaTBgqurN3SfkESKG1HHKRqWrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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