SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf66a645c8420b759e9606f312f7b4054ebe0c0a60e481ac1e96c45cc0df2d2' 
  AND token = 'BaeGKVYDlTg8oGEdM3BFGwy9QJUqDLJlXZUnys9u4T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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