SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde729c7fdfe21cfbd4f41adcb9f7ff2555006039f72e8a83480614706c19a70' 
  AND token = 'LgoZPt5l0zGZ6JOqtbU+tM9ywpFlAxezO7nnv2QaNbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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