SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27edbd153d27e685e95093fd1e9812a1cd6a9df0eea4485b0172cfb1a8f5b111' 
  AND token = 'lZsKV9w70kDE7ErvY+zg18eCJEGns3vIQ3Sy2+4JU7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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