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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a797d0ee8ddeddb0cf90bcd6513bb41793e98441b59144d3d6b6747aceb002d9' 
  AND token = 'pyRIvM7Vfz8IjxOQ9cRxOyx7zS+XQdhgIcjMhNO2XVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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