SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '012348af7333c9ee8d876bd1898d056af569ee3314ba0c20a04e66a187be2d2b' 
  AND token = 'pLvNa2xUJYzPOiqYMTJqMf4XhcWu1rCUaz/SFyB85DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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