SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '555d63ea424bce3b5dffbc87393e19916239dc0018c2f4ee704e2ea3073593ae' 
  AND token = 'Gj+9NVri+T6fIAwvhxJRF1rZYvKoBmDUVNiUTZK/1Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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