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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79c86d242e247deec6f31561a9921b94c17b3884540ee3655298055b65205d42' 
  AND token = 'IhuCFxl5XTznTaa8PF1jy5peDgnoPjE996+91e1OBmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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