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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6faf1f9fb6917efe88710143e0863e6425abea85a9103772b62fe88bc258b866' 
  AND token = 'wJHiuzIUWe/G6LAmguH6MRI6KCWiKReOGfDl4m17gPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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