SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e6149482d83fdd9e08e7584f691a9164304824acaa92e98fbe4995d9b34833' 
  AND token = 'vg5+EwMuG9uhTZB6ZvFE/+dL9/Qv6UWFGNXGuuRa5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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