SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7035230dfca47323e12765f64b538ceb1558cb9375f59e8e715034963111680a' 
  AND token = '+UdkkdzYFfzHFhtIIog6XKpCDsS32EYOurdLaOgGU6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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