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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb843e0ae901fa91a659236c6d21e884b6b11a02e502d3760bbe6ea265a13b86' 
  AND token = 'y2J4Rte0GzNpMc2lGmKY2d003ffLjWVQqRglvMBof7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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