Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65d921d0a1dbd4fe4e86b0a45f23e0173d870d8dc8ecd23b41e487dfa93a0496' 
  AND token = 'KnpRllh40CLgyJbemf1zk5NbLqMN0lx8qcoFJzG0kCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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