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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89aeadfde85bc26af1ea57e45d2aaf1b52f65ba49eee88ffb218b9bb56267b1d' 
  AND token = '5AWA4kokSmbocRZTv3EnVDZhW3gHBDCi5Y8qz4t2EQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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