SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ebc3b228bb44cb8a3bed170f9995ae6aeb691a819c8247ad7cf57e5bac45200' 
  AND token = 'GxJDXZlOBvbmY7Bwy2RbP5gSzz+mcVGz8H8cjzt3JpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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