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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feea059db84541f9892c3094f9bb3b7aa83afc2ac7b53c6f7972a6b5fa948fed' 
  AND token = 'FigQt8/DSubfm/mhIeFA0byjsr1ogifHWveMSrgWCTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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