SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f785fe5708bb1d7c5390c706878953c08b984f66c8d35c8c6fcb1cf3e7934819' 
  AND token = 'L8ib6Sf29/XLZ5VBXYJgUP7iWx7Y5MwxeV1gA9ZK+sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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