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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '887ed75aada5c4518f4ec08d633760c2a5ca0d45eb4cdd2a1c6118598a6b5b3d' 
  AND token = 'ninVPaJlBf9ut5rMtx9BmfOuOdX1UP/n2F34pLDgrJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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