SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8719fbb9cecbc225fd23e10dc4f68396754dc6c1de61802a8f67e5e9bd38359f' 
  AND token = 'Tp/JzSOsDdwA6mUFUcSJAKTqwspPu/ux0HuQ52+R7gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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