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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3db47a7cfa72322d61eab1258dff272ff7575b4117bec4d09a16878e556caf86' 
  AND token = 'DJMb9v5DjFr7CeuquMjP9WZskCMFN8dMpBHsZI24fAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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