SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f36b7c5f7011e60eae5f1c96990c7c8418c87e74892e3ab3f59df5db1856eedd' 
  AND token = 'HRVWD6/olhJNt6zB2HvVskmsXo0QDaQqAe29jw2SvHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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