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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '767217c9f574a9bcca9a95b815a58ea92ad73937dc79633af48eaad295ccb4dd' 
  AND token = '+feQ5tva7CyhrQlRi4gGA3r4gg8gYWH+xCJWDeT/6K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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