SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16735bd681750a1221d7800862c7e2e69481f00abc4e5ff35f0953cc517463d5' 
  AND token = 'og566wvOgD0u0JoX1WG5LZeX3yZTRKgnlQmmOR6jnwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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