SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b16b803f364a13eb29662d6de92779b874fbc36ad17002504a03e48242b1e3a' 
  AND token = 'cyaJoC8D92sBQV9vp7QLHYOF9FTTO4gNgg7+vjx6UGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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