SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83404ae5cb07ec4097f7cd99c8cf4a3d277182429ea3fd59d9ec19893694cf02' 
  AND token = 'Ij+MSzgGoPRZQjB6L/8sBZgIya2aJqueFikyS0DPMv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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