SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f85e354b6292c704a8deb69e2a10b760b314e46a7a74682dd164f5eccd1765b' 
  AND token = '5ZvtgMzROekNq1ICVvmGMNYO+D1oLdAYFzoIO1UFbxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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