SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffbf6fbfd1675c00e00e6aa4eaa6d38892970b095db8c75d4bd80df1d70e19a3' 
  AND token = 'WR9+z6Q1rVP/lQTq8FMclI0jo+SwRzv8TgHKYhxcAgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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