SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65908e264ff14a1f3a95a301c87d7864fde7267a598d4528a85dd176fbc37264' 
  AND token = 'N7ZTZf/xs+YluDgnzVNFy99zHggK10l4jmK7dzp8r0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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