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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12b00c8687e014ca6f37978ace1c34755f0f1d8e0ebe735a97af293820075fb5' 
  AND token = 'zDkxvZuRlYuTnlFkToH8aCt182s38W+uZ/f0EGW8mKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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