SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05fd8dadfb92f6061c728e8e342a4aee0bc7e0d912047d8bec2a6fb85e6b6781' 
  AND token = 'JsVEYEzQHvGUR/pzUwa9IyYq4ZdhzrSvC/5MjwE19YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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