SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '015be20f9b44bd64686a01dd8a8b413f35e3fdb914012e325e65d2f12b6f10a8' 
  AND token = 'trMF5/ws8sxmhg6+bBM4z1/Y0S1quZ5CGwFSbPClLjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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