SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff03d52f3ecebb6096d5732141dc6353fd1ac38a40972a020b01340882332db' 
  AND token = '1uAwhwThkTeNv8LHB7oL+0TJeZ1ZjRV8p62WrpCzAI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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