SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2be2f6e5556afe384953a8a07104e21b5b32d7d9dcfd7baac25d01dc640498bb' 
  AND token = 'rZQk6wuKXQO468lsj3jsqCnISJe009LIGzy+sUp5sCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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