SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c22ea9c9b92d1a202a3b03f683514d4e3fbe956eadc6cb1debe392f17ded085' 
  AND token = 'F81onWCIlJ9kDdCw7zOxgC05huIakKlqFZD76Gj/RR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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