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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd122193dc8ed7506a1787d6d3ef626105e5768200073c05ae945ac9b7d5ece29' 
  AND token = 'HuCnjIB46vBAanTLCqQciXRxtzO/pSFSx6N1IYh4w0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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