SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83bbc9af591141d108d01af09b2b325b23e635ebf85785f2213f8bb73ccbd931' 
  AND token = 'GiY/iDTo13oQ/CqUBok6ZOXk+kE0pmGgZQTLC/s6B/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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