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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5247f26205cff0ad3c08c4adb08d3d980b6c7053a7a1a85e8f4a2b07e96c48b5' 
  AND token = '0bWclLr5G1ORZ0JHvNGVNhOORHWuwwQRnkIEcQHdPMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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