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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bfacf9420eb207d894a4a9a0c821ae92b256dca27b299fe0072421fbcd7dcd3' 
  AND token = 'y1/DckAL5G6884BgBlva5o+GwLTWaIOyeeqnTgtspfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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