SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c082f17bc93b86d049ea2745bbef3160fd74b0faddc9115e4569e1f1188798e' 
  AND token = '1NiVZh3QSTrYFcqbkDTuuKBAgeMphSxDfld6978W/vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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