SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d2a58848af9a23ad7bc1a2b55006900b3f192a63123f206ae418b36d012291c' 
  AND token = 'cIAENIMS0bqpRjnl51gpnAKeJHYVh47fgEJnlrOZXUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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