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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0446f8350df85ed7fe32bb05124b65561f77cf3ce7a6020218316acd65a002ca' 
  AND token = 'qT1sW8+zgBCiEUe8HRUaLQ2z5pUHk5FTEajrwDBEK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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