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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96b457d7c03433452f4e95326647cac9c4a52fefd27f7c97e8be6d1a596236db' 
  AND token = 'XlTnNPmdlKFl442v7pqDNB/v9rKxKlOasnff3G6igWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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