Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dba6aa2d1aa2635db7030b7e6a2bbd83b285e888eb0693aa78ed559d576ff9b3' 
  AND token = '4qUrUhKqL8MyDHiW5l5vrQ+AqMpCEJLvdqL4hFlVLsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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