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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '578e65a85cdb1978e08b81abf463031977cc5a8b20b8606749e0ba99dd258d59' 
  AND token = 'zAhwyV6bTD6jqOE+uI3euN50QcwV1Nn3O6n8p9JJkog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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